Auditory Evoked Potentials For The Evaluation Of Hearing Sensitivity In Navy Dolphins Assessment Of Hearing Sensitivity In Adult Male Elephant Seals PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Auditory Evoked Potentials For The Evaluation Of Hearing Sensitivity In Navy Dolphins Assessment Of Hearing Sensitivity In Adult Male Elephant Seals PDF full book. Access full book title Auditory Evoked Potentials For The Evaluation Of Hearing Sensitivity In Navy Dolphins Assessment Of Hearing Sensitivity In Adult Male Elephant Seals.
| Author | : |
| Publisher | : |
| Total Pages | : 52 |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
Download Auditory Evoked Potentials for the Evaluation of Hearing Sensitivity in Navy Dolphins. Assessment of Hearing Sensitivity in Adult Male Elephant Seals Book in PDF, ePub and Kindle
A custom auditory evoked potential (AEP) system was used to assess the feasibility of rapidly testing the hearing of bottlenose dolphins by tracking the magnitude of the envelope following response (EFR). Tests were conducted in-air (N=4) and on submerged dolphins (N=3) for which behavioral audiograms had been obtained in San Diego Bay or a quiet above ground pool. For in-air AEP measurements, differences between AEP and pool behavioral thresholds increased with threshold magnitude and ranged from 0 to +18 dB. For underwater AEP measurements, differences between AEP and pool behavioral thresholds varied from - 10 to 9 dB. After benchmarking the AEP approach, AEP thresholds were obtained from 42 dolphins housed at the Navy Marine Mammal Program. Animals ranged from 4 to 47 years of age and consisted of 28 males and 14 females. Consistent with other mammalian systems, the range and sensitivity of hearing declined with age with onset typically occurring between the ages of 20 and 30. Males generally exhibited hearing loss at a younger age than female dolphins. The AEP system was subsequently applied to the northern elephant seal (Mirounga angustirostris) to determine how to adapt AEP approaches to larger animals with less robust auditory systems.
| Author | : |
| Publisher | : |
| Total Pages | : 52 |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
Download Auditory Evoked Potentials for the Evaluation of Hearing Sensitivity in Navy Dolphins. Modification P00002: Assessment of Hearing Sensitivity in Adult Male Elephant Seals Book in PDF, ePub and Kindle
A custom auditory evoked potential (AEP) system was used to assess the feasibility of rapidly testing the hearing of bottlenose dolphins by tracking the magnitude of the envelope following response (EFR). Tests were conducted in-air (N=4) and on submerged dolphins (N=3) for which behavioral audiograms had been obtained in San Diego Bay or a quiet above ground pool. For in-air AEP measurements, differences between AEP and pool behavioral thresholds increased with threshold magnitude and ranged from 0 to +18 dB. For underwater AEP measurements, differences between AEP and pool behavioral thresholds varied from -10 to 9 dB. After benchmarking the AEP approach, AEP thresholds were obtained from 42 dolphins housed at the Navy Marine Mammal Program. Animals ranged from 4 to 47 years of age and consisted of 28 males and 14 females. Consistent with other mammalian systems, the range and sensitivity of hearing declined with age with onset typically occurring between the ages of 20 and 30. Males generally exhibited hearing loss at a younger age than female dolphins. The AEP system was subsequently applied to the northern elephant seal (Mirounga angustirostris) to determine how to adapt AEP approaches to larger animals with less robust auditory systems.
| Author | : Mandy Lee Hill Cook |
| Publisher | : |
| Total Pages | : 134 |
| Release | : 2006 |
| Genre | : |
| ISBN | : 9781109866711 |
Download Behavioral and Auditory Evoked Potential (AEP) Hearing Measurements in Odontocete Cetaceans Book in PDF, ePub and Kindle
Finally, the beaked whale was most sensitive to high frequency signals between 40 and 80 kHz, but produced smaller evoked potentials to 5 kHz, the lowest frequency tested. The beaked whale hearing range and sensitivity were similar to other odontocetes that have been measured.
| Author | : |
| Publisher | : |
| Total Pages | : 5 |
| Release | : 2004 |
| Genre | : |
| ISBN | : |
Download Standardization of Electrophysiological Measures of Hearing in Marine Mammals Book in PDF, ePub and Kindle
The primary goal of this project is to develop the technology and methods required to make quantitative, repeatable, and interpretable measurements of pinniped hearing sensitivity using averaged evoked potentials recorded from the surface of the head. This effort will advance understanding of marine mammal auditory physiology and provide the tools necessary for the study of population-level and species-level hearing so that noise impacts in marine ecosystems can be better understood. The immediate goals of this project are as follows: (1) transfer available technology from ongoing research with cetaceans to establish an appropriate system for recording auditory evoked potentials in pinnipeds, (2) develop protocols for electrode placement and stimulus presentation that result in optimal evoked potential recordings, (3) measure the hearing sensitivity of individuals from multiple pinniped species using evoked potential methodology, (4) benchmark the evoked potential measures of hearing against standard behavioral measurements obtained for the same individuals, and (5) compare both behavioral and physiological hearing measures obtained for pinnipeds with those obtained under similar conditions for dolphins. Development of standardized procedures and technologies for evoked potential audiometry that are suitable for marine mammal species are necessary to achieve the ultimate goals of understanding species-specific population level variations in hearing sensitivity and to move toward the ability to measure the hearing sensitivity of species for which behavioral methodologies are not applicable (e.g., baleen whales, beaked whales, Antarctic seals). Such information is essential to mitigating the effects of anthropogenic noise in the marine environment and furthering scientific knowledge of the role of acoustics in marine mammal biology, behavior, and ecology.
| Author | : Martin Burger |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
Download Assessment of the Individual Auditory Perception Via Evoked Potentials Book in PDF, ePub and Kindle
| Author | : Annemarie Surlykke |
| Publisher | : Springer |
| Total Pages | : 312 |
| Release | : 2014-07-19 |
| Genre | : Science |
| ISBN | : 1461491460 |
Download Biosonar Book in PDF, ePub and Kindle
Two groups of animals, bats and odontocetes (toothed whales), have independently developed the ability to orient and detect prey by biosonar (echolocation). This active mechanism of orientation allows these animals to operate under low light conditions. Biosonar is a conceptual overview of what is known about biosonar in bats and odontocetes. Chapters are written by bat and odontocetes experts, resulting in collaborations that not only examine data on both animals, but also compare and contrast mechanisms. This book provides a unique insight that will help improve our understanding of biosonar in both animal groups.
| Author | : William John Richardson |
| Publisher | : |
| Total Pages | : 488 |
| Release | : 1991 |
| Genre | : Airplanes |
| ISBN | : |
Download Effects of Noise on Marine Mammals Book in PDF, ePub and Kindle
| Author | : Kelly Martin |
| Publisher | : |
| Total Pages | : |
| Release | : 2011 |
| Genre | : |
| ISBN | : |
Download Underwater Hearing in the Loggerhead Turtle (Caretta Caretta) Book in PDF, ePub and Kindle
Methods for collecting behavioral audiograms are often time consuming and require trained, captive subjects. It is more practical to measure hearing sensitivity using electrophysiological methods, such as auditory evoked potential (AEP) testing, in which electrodes measure action potentials in response to acoustic stimuli. These data can be collected in a matter of hours. However, results should be verified through behavioral testing. Current knowledge of marine turtle auditory abilities is based on a few electrophysiological tests. The purpose of this study was to collect and compare behavioral and auditory evoked potential audiograms in a captive adult loggerhead turtle (Caretta caretta). The behavioral audiogram was collected using a go/no-go modified staircase method utilizing 2-second pure-tone stimuli. AEP thresholds were measured underwater using subdermal electrodes placed beneath the frontoparietal scale, dorsal to the midbrain. Action potentials were measured in response to 50 ms tonal stimuli and averaged over a maximum of 1,000 responses. Evoked potential testing yielded thresholds from 100 - 1131 Hz with peak sensitivity at 200 and 400 Hz (110 dB re 1 μPa). Behavioral testing yielded thresholds from 50 - 800 Hz with peak sensitivity at 100 Hz (98 dB re 1 μPa). Behavioral thresholds averaged 8 dB lower than AEP thresholds from 100 to 400 Hz and 5 dB higher at 800 Hz. Results indicate that behavioral and evoked potential techniques are suitable for determining marine turtle hearing sensitivity. AEP testing is a good alternative when dealing with wild or untrained animals and when time is a critical factor.
| Author | : |
| Publisher | : |
| Total Pages | : 5 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
Download Electrophysiological Techniques for Sea Lion Population-Level Audiometry Book in PDF, ePub and Kindle
The objectives of this project are to (1) modify electrophysiological techniques previously developed for dolphins to assess hearing sensitivity in California sea lions (Zalophus californianus), (2) benchmark the techniques using behavioral hearing data from the same individual, and (3) apply the techniques to measure the hearing sensitivity of all available Navy sea lions.
| Author | : National Research Council |
| Publisher | : National Academies Press |
| Total Pages | : 220 |
| Release | : 2003-05-22 |
| Genre | : Science |
| ISBN | : 0309133157 |
Download Ocean Noise and Marine Mammals Book in PDF, ePub and Kindle
For the 119 species of marine mammals, as well as for some other aquatic animals, sound is the primary means of learning about the environment and of communicating, navigating, and foraging. The possibility that human-generated noise could harm marine mammals or significantly interfere with their normal activities is an issue of increasing concern. Noise and its potential impacts have been regulated since the passage of the Marine Mammal Protection Act of 1972. Public awareness of the issue escalated in 1990s when researchers began using high-intensity sound to measure ocean climate changes. More recently, the stranding of beaked whales in proximity to Navy sonar use has again put the issue in the spotlight. Ocean Noise and Marine Mammals reviews sources of noise in the ocean environment, what is known of the responses of marine mammals to acoustic disturbance, and what models exist for describing ocean noise and marine mammal responses. Recommendations are made for future data gathering efforts, studies of marine mammal behavior and physiology, and modeling efforts necessary to determine what the long- and short-term impacts of ocean noise on marine mammals.
